Two stroke, opposed-piston engines with engine braking

a technology of opposed pistons and engine braking, which is applied in the direction of machines/engines, output power, non-mechanical valves, etc., can solve the problems of piston loss, improve engine braking operation, increase the flow of charge air, and increase the braking power available

Active Publication Date: 2012-08-23
ACHATES POWERS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]The applicants' critical realization is that provision of an engine braking valve to each cylinder of an opposed-piston engine that can be opened to release air from the cylinder as the pistons cycle between BDC and TDC positions enables a simple, inexpensive and easily-operated engine brake.
[0016]The cylinder is externally scavenged with a supercharger, which is beneficial to the engine braking operation because it increases the flow of charge air through the engine braking valve, thereby increasing the braking power available.

Problems solved by technology

In this manner the pumping work done by the pistons is lost as heat as the charge air flows out through the engine braking valve.

Method used

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  • Two stroke, opposed-piston engines with engine braking
  • Two stroke, opposed-piston engines with engine braking
  • Two stroke, opposed-piston engines with engine braking

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Embodiment Construction

[0025]The invention described in this specification is presented in an explanatory context that includes a ported, two-stroke engine having at least one cylinder with a bore in which a pair of pistons is disposed with their end surfaces in opposition. The engine is not limited to any specific number of crankshafts. For example, the invention can be applied to opposed-piston engines with one crankshaft, with two crankshafts, and with three or more crankshafts. From another aspect, the invention can be applied with any scheme for piston articulation in opposed-piston engines. In other aspects, the invention can be applied to an internal combustion engine construction that includes one or more ported cylinders, each with a bore, piston-controlled exhaust and intake ports, and a pair of pistons disposed in opposition in the bore.

[0026]In FIG. 3, an internal combustion engine 49 is embodied by an opposed-piston engine having one or more cylinders 50. For example, the engine may have one ...

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PUM

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Abstract

In a two-stroke opposed-piston engine, a ported cylinder with a pair of opposed pistons is equipped with an engine brake including an engine braking valve that can be opened to release air from the cylinder as the pistons cycle between BDC and TDC positions.

Description

PRIORITY[0001]This application claims priority to U.S. provisional application for patent 61 / 463,815, filed Feb. 23, 2011.RELATED APPLICATION[0002]This application contains subject matter related to that of U.S. patent application Ser. No. 13 / 373,448, filed Nov. 14, 2011, titled “Two-Stroke, Opposed-Pistons with Compression Release for Engine Braking”.BACKGROUND[0003]The field is internal combustion engines. Particularly, the field relates to two-stroke engines with ported cylinders. In more particular applications, the field relates to constructions and methods for releasing charge air from a ported cylinder equipped with opposed pistons so as to enable engine braking.[0004]When compared with four-stroke engines, ported, two-stroke, opposed-piston engines have acknowledged advantages of specific output, power density, and power-to-weight ratio. For these and other reasons, after almost a century of limited use, increasing attention is being given to the utilization of opposed-pisto...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F02B25/08F02D13/04F01L9/10
CPCF01L1/38F02D21/08F01L13/06F01L2101/00F02B25/08F02B29/0406F02B33/38F02B37/04F02B75/282F02B2075/025F02B2275/14F02D13/04F02M25/0715Y02T10/123F01L9/02F02M26/13F01L2301/00Y02T10/12F01L9/10
Inventor FUQUA, KEVIN B.READ, IAIN J. L.
Owner ACHATES POWERS INC
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